c# qr code zxing Part 6: Networking in Visual C#

Printer QR Code 2d barcode in Visual C# Part 6: Networking

Part 6: Networking
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Microsoft Windows XP Inside Out, Second Edition
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Part 6: Networking
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Figure 25-7. The Create Shared Folder Wizard provides an alternative to sharing a folder from Windows Explorer.
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Troubleshooting
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The New File Share command doesn t appear. If sharing has not yet been enabled on your computer (by default, sharing is disabled on a new Windows XP installation), the Shared Folders snap-in is of little use. Worse, it doesn t tell you what the problem is or how to solve it. The solution, fortunately, is simple: First, be sure that Simple File Sharing is disabled. (If you disable Simple File Sharing while the Shared Folders snap-in is running, you might need to close and reopen the snap-in before the New File Share command appears.) If that doesn t make the command appear in Shared Folders, then run the Network Setup Wizard or share a folder using Windows Explorer; either action enables sharing. For details, see Enabling File Sharing, page 907.
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Some users of Windows XP Home Edition have made the discovery that they can get to the Create Shared Folder Wizard by typing shrpubw at a command prompt. It might appear that you could use this trick to circumvent the all-or-nothing sharing limitations imposed by Simple File Sharing. Alas, using the wizard to create a share with custom permissions is of no use when Simple File Sharing is enabled which is all the time in Home Edition. That s because on a machine running Home Edition, all network users are authenticated as Guest. Therefore, it does no good to set up different permissions for different network users because all users are logged on using the Guest account.
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Managing Shared Folders and Printers
Removing a Share Using the Shared Folders Snap-In
Removing a share is as easy as right-clicking the share and choosing Stop Sharing. This is equivalent to visiting the folder s properties dialog box in Windows Explorer and clearing the Share This Folder check box.
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Viewing and Disconnecting Sessions
Each user who connects to your computer creates a session. You can use Shared Folders to see who is currently connected to the computer as well as what files they have open. Click Sessions in the console tree to have the current sessions appear in the details pane, as shown in Figure 25-8.
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Figure 25-8.
The Sessions folder shows all open connections.
Tip See who is authenticated If you re trying to determine why some users have access to certain folders and others don t, it s helpful to know whether they re being authenticated as themselves or as Guest. That s easy to do with Shared Folders. In the Sessions folder, the rightmost column is titled Guest; its value is either Yes (authenticated as Guest) or No (authenticated as named user). Besides seeing who is connected, you can also disconnect any or all sessions. Right-click a session and choose Close Session to close a single session. Right-click Sessions in the console tree and choose Disconnect All Sessions to close all the open sessions. Don t do this capriciously; users can lose information if you close a session while they have documents open.
Part 6: Networking
Microsoft Windows XP Inside Out, Second Edition
Viewing and Closing Files
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Click Open Files in the Shared Folders console tree to see a list of shared files that are currently open for other users, as shown in Figure 25-9. You can close an individual file by right-clicking it and choosing Close Open File. You can close all the open files at once by right-clicking Open Files in the console tree and choosing Disconnect All Open Files. If you close a document file before the user has saved new information, you might cause the information to be lost.
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Figure 25-9. users.
The Open Files folder shows all the files that have been opened by current
Warning Other Users
Because closing sessions and files can cause a loss of information, you should warn users who have open sessions and files before you close them. The Shared Folders snap-in includes a Send Console Message command for this purpose. The command relies on the Messenger service, however, and because this service has been widely abused by spammers, it is turned off by default in Windows XP Service Pack 2. We recommend alternative methods of notification (instant messaging, e-mail, the telephone, a hearty shout). If you decide to use console messages, first be sure the Messenger service is turned on at your intended recipients computers. Then right-click Shared Folders or Shares in the console tree and choose All Tasks, Send Console Message. (This command does not appear when you right-click Sessions or Open Files.) When the Send Console Message dialog box appears, the names of all the computers with open sessions (which includes all computers with open files) are in the Recipients list. Simply type your warning message and click Send.
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